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 Sep29 revised Reference of explanation of this result about Fourier transforms in euclidean space edited tags Sep29 revised A point-set topology problem typo Sep29 answered A point-set topology problem Sep29 comment liminf sequence of C-infty functions The question makes no sense as it stands, as the functions are defined on different domains $\mathbb R^n$. Presumably this was meant to be $\mathbb R^k$ with a different variable $k$? Sep28 comment Popcorn function Please don't use abbreviations like "smb". The effort of a handful of keystrokes you save stands in no relationship to the effort you cause for everyone who tries to understand your post and isn't aware of the abbreviation. Sep28 comment Is a square matrix whose diagonal and antidiagonal elements are all zero always singular? @Rahul: The secondary diagonal is the one that goes from lower left to upper right; so a $2\times2$ matrix with the given property has all zero entries. Sep28 answered Is a square matrix whose diagonal and antidiagonal elements are all zero always singular? Sep28 revised Regularity property of tournaments spelling Sep28 revised Integration by inspection - how? some encouragement Sep28 answered Integration by inspection - how? Sep28 revised Proposition vs Theorem edited tags Sep28 comment How many possible outcomes can there be in the lottery? The detailed question is always below; please don't put things in the title that would apply to all questions. Sep28 revised How many possible outcomes can there be in the lottery? copy-edit Sep27 comment Domain of a function by inspection See also this question on how the term "domain" is being used here. Sep27 comment Term for generalized antisymmetry? The expression "antisymmetric up to equivalence" is used in at least some publications. Sep27 comment Analytical calculation of the total surface of overlapping spheres Two times the surface area of one sphere is $8\pi R^2$. And the spheres overlap if $d\lt 2R$, not $d\lt R$. Sep27 comment Extracting angular velocity tensor from orthogonal matrices @linello: I don't understand the question. The fragment "but maybe can be useful" has no subject -- what can maybe be useful? And what do you mean with "How to deal with better derivative approximation scheme"? Which scheme is this referring to? Sep27 comment Show the vector calculus integral is zero @QED: I've made the hyperplanes and the limiting process more explicit -- I hope it's clearer now? Sep27 revised Show the vector calculus integral is zero slightly more explicit Sep27 comment Convergence of prime series Punctuation should go inside double dollar signs (with a \; space); otherwise it gets placed on the next line.